Advanced Encryption Standard in Cryptography- Session 3

  
    Exercise 1
 
    The following four words are corresponding to the input key in Advanced Encryption Standard that uses a 128 bit key.

    W0  –  5e 7f 1a 23
    W1  –  31 2f 3a 11
    W2  –  72 19 e1 f7
    W3  –  23 58 13 a3 
    
    Determine the next four words W4, W5, W6 and W7 to that will be derived from W0, W1, W2 and W3 to be used in round 2 of the encryption process. Show all the steps that led to the result in your answer.
    
    Exercise 2
    
    The following four words are corresponding to the input key in Advanced Encryption Standard that uses a 128 bit key.
    
    W0  –  68 71 6a 6b
    W1  –  71 6e 7a 72
    W2  –  32 79 5e 47
    W3  –  13 28 43 5a 
    
    Determine the next four words W4, W5, W6 and W7 to that will be derived from W0, W1, W2 and W3 to be used in round 2 of the encryption process. Show all the steps that led to the result in your answer.
    
    Exercise 3
    The following four words are corresponding to the input key in Advanced Encryption Standard that uses a 128 bit key.
    
    W0  –  69 73 62 6f
    W1  –  73 61 74 69
    W2  –  72 69 6e 67
    W3  –  73 68 63 6a 
    
    Determine the next four words W4, W5, W6 and W7 to that will be derived from W0, W1, W2 and W3 to be used in round 2 of the encryption process. Show all the steps that led to the result in your answer.